Safety locking device



Nov. 22, 1932. o. A. cARLsoN SAFETY LOCKING DEVICE Filed Aug. 18, 1930 3 SheetsSheet l INVENTOR @5cm 55L, Qiew'lsvn 9* 47- W ATTORNEYS Nov. 22, 1932. 0. A. CARLSON SAFETY LOCKING DEVICE Filed Aug. 18, 1930 3 Sheets-Sheet 2 INVENTOR Q5 @sccw g M45011 -1. 1 -M ATTORNEYS Nov. 22, 1932. o. A. cARLspN SAFETY LOCKING DEVICE Filed Aug 18, 1930 5 Sheets-Sheet 3 Fjzgmlfi 5:5

ATTORN EYS Patented Nov. 22, 1932 UNITED STATES PATENT: GF'FlG-E OSCAR'A. CARLSON, or ABERDEEN; WASHINGTON SAFETY LOCKING DEVICE Application filed August18, 1930. Serial No. 475,903.

' My present invention relates-to-the improvements in'the art of safety locking a mechanism that I have perfected my present invention, therefore:

The principal object of my invention is to provide a closure locking device that will permit the closure to be opened alsmall amount before the locking mechanism becomes operative.

A further object of my invention is to provide a locking device which may be, operated "at a point some distance removed from the closure.

'A further object, is to provide a locking device which will automatically lock when the closure has been opened sufficiently sashes of a sliding double windowj The winet dow casing has been shown as removed to better illustrate" the parts i of my device.

Figure 2 is a side elevation of the remote l i any convenient manner.

control means. I

Figure 3 is a s de vlew n 'elevationfofthe 5 'sam'e.

A further object is to provide a locking device whose various parts are so arranged.

Figure 4 is a View taken along the line 4 -4 of Figure 3. r

Figure 5 is a view similar to Figure 4 but showmgthe pawl member inthe released position.

Figure '6 is a cross-sectional view taken along the line 6'6 of Figure 2. V

Figure Tis a 'cross sectional view taken along the line 77 of Figure 3.

Figure 8 is an enlargedelevation intended to better illustrate the locking arrangement of my device.

Figure 9 is a' longitudinal sectional view through the lockingmechanism proper.

Figure 10 is a similar view with the window moved upwardly from the position of Figure 9, and showing a lockingmember of slightly difierent shape;

Figure 11 is a cross-sectional view along" ,7

the line 1ll1 of Figure 9. V

Figure 12 illustrates an alternate means for operating my locking mechanism.

Referring to the drawings throughout which like reference characters indicatelike' parts, numerals let and 15 designate respec tively the lower and upper windows ofa sliding window arrangement. These may be considered as being the typewliichare held in position by counter-weights of a form well known. Secured by being morticed'into the sash are bearing plates 16 and 17 respectively. These are provided with an opening 18, at which point anopening is morticed into the sash as at 20. Adapted to engage open ing 18 is a locking member 22, which is constantly urged toward the sash by a compression spring 24. The locking member may be provided with a locking bit which is square on both sides as is shown in Figure 9, or may have one square face and one slanting face as at 26 of Figure 10. The purpose of this slanting upper surface is to permit the closing of the window at any time without manipulating the lock. The form shown in Figure 9 locks the sliding member against movement in either direction.

The locking member 22 may be operated in p v The form I:have illustrated, which is pivotally secured at 28, is most easily operated by a small cam mem her 30 adapted to engage a spur 32 on the locking member. As a matter of convenience in manufacturing I prefer to mount cam 30 on a square shaft which terminates in an operatin arm 34. I have found it desirable to provide a safety means which will prevent the tampering with this cam by an person without. This consists of a. U-s iaped metal member 36 which fits over the lock in such a manner that one leg of the U will extend down below the opening in which the squared shaft passing through cam 80 operates.

I believe it will be apparent that many different arrangements might be used to operate cam 30. One I have found most satisfactory, however, is to connect to arm 34 a. flexible tension member 40. This may be a short-linked chain, a cable or might even be a woven cord. Metal, of course, is the most preferred. This for convenience is passed over a roller or sheave at 38 and then is carried along the wall if installation is taken as in Figure 1 in connection with sliding windows, to a point sufliciently far removed from the window that it cannot be operated by an outsider through the partially opened window.

In a case such as is shown in Figure 1 it will be understood that two separate sheaves should be used, although both may be on the same pin. In the case of bins, however, and sliding doors which are merely opened for ventilation purposes, a large number of these control devices might be grouped for convenience as I believe it will be apparent that the tension members 40 might be of any con venient length. At the designated position members 40 are wound upon a central spindle 42 which member is shown more clearly in Figures 3 and 6. Winding effort may be applied by any convenient means as by the removable key 44. The whole mechansm must act to compress spring 24. Therefore, if it is desired to hold the same in the di engaged position as in Figure 9 it is necessary to provide a locking means for spindle 42. I have found it convenient to use a ratchet wheel 46 and to provide an engageable pawl member 48. I have further provided a compression spring 50 adapted to constantly urge the pawl into engagement. As this mechanism must be concealed from view as by the cover plate 52, some means for releasing the pawl must be provided. This may be accomplished by universally pivoting a release member 54 at 56 and bringing the same out through plate 52. As a further convenience I have provided the cam slot 58. Figures 4 and 5 show the released and engaged positions sufficiently clear so that I believe no further description is necessary.

As the whole purpose of this device is to provide positive safety, I have further provided that where arm 34 is bent to form the operating handle of the locking member that the same be enclosed in a metal box which is opened on one side to permit the operation of member 34. This construction is best shown in Figure 11 wherein two walls are produced by using an angled member 60 and a cover plate 62.

Certain operating conditions, particularly when installed in old structures, make it more desirable to have the lock operating means immediately adjacent the locking member. To this end I have provided the alternate mechanism shown in Figure 12 wherein the squared shaft 64 which takes the place of member 34 is enlarged at its outer end to provide the rotatable cylinder of a pin tumbler lock. The tumblers are of the usual twoa piece variety, backed up by coil springs as indicated at 66. The exact construction here is relatively unimportant as any form of locking mechanism might be used instead of that shown. I have found it particularly desirable, however, to use a specially constructed key 68, which has a large finger engaging surface and has the portion of the key immediately adjacent the finger surface made quite heavy and of considerable breadth, as is indicated at 70. This is intended to engage a slot milled in the end of the member 64 so it will act much as a screw-driver in a screw slot, and thus enable one to put considerable turning effort on member 64 without danger of injury to the tumbler engaging portion of the key.

Method of operation In operating my device, assuming for instance the same is applied to a hung window, the window may be moved, referring now to window 14 of Figure 1, upwardly any desired amount until opening 18 comes opposite the locking member 22 where its upward movement will be arrested. If the locking member is of the form shown in Figure 9 no further movement of the window in either direc tion will be possible. If the chamfered off looking member, as shown in Figure 10 is employed it will still be possible to close the window but it cannot be opened further, assuming the window to be locked in its extreme opened position permitted by the lock. If it is desired to open the window further it may be done by winding up on key 44. This will retract member 40 which, operating through lever 34, will revolve cam 30, thereby moving locking member 22 to the position indicated in Figure 9. If pawl 48 is now allowed to engage ratchet 46 the lock member will be held in a retracted position and the window can be freely moved either upwardly or downwardly. However, by moving the released member 54 to the position shown in Figure 5 it will operate upon pawl 48 revolving it about its pivot 72 and thus free, by slackening ofi' members 40, the locking member 22 so that spring 24 can operate to force the locking member against the contact strip 16, and as soon as opening 18 is in registry, lock the same against further movement.

When the key member shown in Figure 12 is used it will be necessary for the operator to hold the locking member out of engagement while moving the window. This type of construction has the disadvantage in that being key-operated the key must be removed if the device is going to present appreciable safety, and when so removed is always subject to loss, and further one such key must be provided for each member of the household,

a fact often times very inconvenient.

I have described my device in connection with hung windows. I believe it will be apparent that it will work equally as well on any sliding closure. This might be sliding doors, the tops of bins used for storage, and many other such uses. I have found that quite often it is very much desired, particularly in ware and store houses, to have cer* tain doors and bin covers partially open so that a free circulation of air may be obtained. Yet it is desirable to prevent the full opening of such closures in order to guard against unlawful entry of unauthorized persons.

In Figure 1 I have shown two devices, as shown in Figure 2, mounted together and using a single cover plate. This would no doubt be a very desirable form for the average dwelling.

The foregoing description and the accompanying drawings clearly disclose a preferred embodiment of my invention but it will be understood that this disclosure is merely illustrative and that such changes in the invention may be made as are fairly within the scope and spirit of the following claim.

What I claim is:

A locking device for a sliding closure consisting of a bearing plate secured to the sliding member and having a latch opening therein; a locking member pivotally secured to the window casingadapted to normally rest upon said plate; means adapted to urge said locking member against said plate; a cam adapted to retract said locking member against said urging means; control means for said cam adapted to be placed at a point removed from the sliding member; said means consisting of a spindle, a ratchet wheel secured to said spindle, a pawl adapted to engage said ratchet and a release member adapted to control said pawl; and a flexible tension member connecting said control means and the said cam.

In witness whereof, I hereunto subscribe my name this 31st day of July A. D. 1930.

OSCAR A. CARLSON. 

